Ventilating-flue cap



(No Model.)

H. L. DAY.

VBNTILATING PLUB GAP.

. Patented` May 6, 1884.

Wmv-amis EMM www UNITED STATES l PATENT OFFICE.

I-IENEY LAwEENoE DAY, oF MINNEAPOLIS, MINNESOTA.

VENTILATING-FLUE CAP.

SPECIFICATION forming part of Letters Patent No. 297,972, dated May A6, 1884.

l y Application led September 18, 1883. (No model.)

To all whom it 'may concern: i

Be it known that I, HENRY LAWRENCE DAY, a citizen of the United States, and a resident of Minneapolis, in the county of Hennepin, in the State of Minnesota, have invented certain new and useful Improvements in Ventilating-Flue Gaps, of which the following specification is a full, clear, and exact description, reference being also had to the accompanying drawings, in which-e Figure l is a sectional elevation, and Fig. 2 is a plan view, of the Ventilating-cap. Fig. 3 is a cross-sectional view on the line x .fr of Fig. l. v Figs. 4. and 5. are sectional elevations, sho'wing slight modifications of the form. Fig. 6;is a plan view of the Ventilating-cap with the dome removed.

A is the main flue or shaft, around which, a short distance down from'the top, is a projecting at ring, B, and attached to the top of the shaft by bars a is an outwardly-daring jacket or shield, C, leaving a space, i, between it and the flue, the lower edge of the shield coming below the top of the line andthe upper edge' coming above the'top of theiiue, as shown.

D is a conical top `or dome connected to the flue A by standards g, and having an upturned lower edge, b, and downwardly-curved bottom E. The top of the upturned edge b is level with the upper -edge of the shield C, leaving a space, d, between them; andthe bottom E is some distance above the top of the iiueA, leaving a large space, h, between them. The outer edge of the bottom E slants upward and outward, as shown at e, so as to enable the air, smoke, &c., to escape more freely from the flue, and also to prevent the air-currents from being driven down the flue. By this arrangement the dome D prevents any air-currents being driven down the iiue A, while its upturned. edge b catches all the currents which strike the dome and turns them upward and outward, thus creating by friction an upward current in the 'narrow throat d, which greatly assists in creating aI draft in the flue. The same effect is produced by the edge e and outwardly-Haring shield C,when the currents are blown upward, the band B serving to prevent the air from blowing directly up between the shield and iue.

In Fig. 5 the bottom E is shown of a cone shape, reversed from the cone D, but the action is the same.

In Fig. i the upturned edge bis shown of a rounded form and the bottom E removed, which forni may be found advantageous under sonie circumstances; but I prefer the form 4 shown in Fig. 1, as the bottom E renders the exit of air or smoke from the flue more easy.

The standards g are shown connected to a ring, F, which fits down into the top of the flue, so that the dome D and bottom E may be easily removed from the iiue, to enable its interior to be reached for cleaning, repairs, &c. I do not conne myself to aconical shape of the'dome D, though I prefer that shape;

and although the dome operates with excellent effect with the upturned edge b, yet it will work with good effect without it.

Having described myinvention and set forth its merits, what I claim is- 1. The combination ofthe ilue A, outwardlyaring shield C, Vdome D, and convex bottom E, substantially as and for-the purposeherein specified.

2. The combination of the iiue A, deflectingring B, flaring shield C, dome D, and convex bottom E, substantially as and for the purpose herein specified.

3. The combination of the due A, shield C,

and dome D, having the lower upturned edge,

b,- and convex bottom E, substantially as set forth.

4. The combination of the flue A, shield C, dome D, standards g, and ring F, substantially as described.

- 5. The combination of the iiue A, deflectingring B, flaring-shield C, dome D, having the upturned edge b, and the bottom E, substantially as and for the purpose herein specified.

In testimony whereof I have hereunto set my hand in presence of two subscribing Witnesses.

HENRY LAWRENCE DAY.

Witnesses:

C. N. WooDwARD, LoUIs FEEsER, Sr. 

